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Specifications: Minimum Division: Salinity: 0.1% Refractive Index: 0.001 (ATC) Temperature Compensation Range:10Â°C--30Â°C Determines the amount of dissolved salt and dissolved solids Approved by strict quality and safety standards Durable and built to last long Heavy-duty and lightweight with its aluminum construction Accurate testing results guaranteed Made with the highest and finest quality of aluminum & rubber that makes it lightweight Cushioned with soft & comfortable non-slip rubber Extremely easy-to-use and calibrate

Salinity Refractometer is designed for testing the concentration of salt water and brine and used for quality control in research and clinical laboratories and marine industry. Its scale provides a direct reading of the specific gravity and concentration (part per Thousand) of salt in water. One scale checks the NaCl levels with the range of 0-100 ppt (with 1 ppt scale divisions) and the other scale gauges Specific Gravity with a range of 1.015 to 1.030 (Â±0.001 accuracy). Both enables the direct determination of salinity in water that contains dissolved salt and little or no other dissolved solids. It is suitable for a marine saltwater tank. It's FULLY EQUIPPED with ATC that automatically adjust itself to correct temperature discrepancies during use. Capable of measuring with high accuracy and provides precise results. It's equipped with vivid and sharp reticle chart for easy and comfortable reading. It uses ambient light only and no batteries are needed. Made by experienced craftsmen and are unlikely to break down! Plus an option to get an extra 50pcs of transfer pipettes in 1ml and/or 3ml, a bottle of dioptic oil (calibration oil) and a reference block just by adding a small amount to your order, see Available Options below .

If Customers Prefer to Have a Model Which Has (C) and (F). The Model RHA-600ATC is Good Choice as the Temperature in C and F Were Both Lised in Its Scale!
It Has Three Scales for Glycol Analysis / Testing and Battery Liquids Testing
Measuring Range:
Ethylene Glycol: -70Â°C-0Â°C(-90Â°F-32Â°F)
Propylene Glycol: -60Â°C-0Â°C(-70Â°F-32Â°F)
Battery Fluids:1.100-1.400sg
Resolution Factor: 5Â°C, 10Â°F,0.01sg,
(ATC)Temperature Compensation Range:10Â°C-30Â°C
â€¢ Approved by strict quality and safety standards
â€¢ Durable and built to last long
â€¢ Heavy-duty and lightweight with its aluminum construction
â€¢ Easy to focus and calibrate
â€¢ Accurate testing results guaranteed
â€¢ Made with the highest and finest quality of aluminum & rubber that makes it lightweight
â€¢ Cushioned with soft & comfortable non-slip rubber
â€¢ Extremely easy-to-use and calibrate

RSGN-100ATC is an Upgraded Version of RSG-100ATC With an Additional Features of Buillt-In Calibration Knob, Has Much Lighter Weight, and Longer
This Refractometer is Specifically Created for Brewing of Beer
Measuring Range: 0-32%Brix; SG: 1.000-1.130
Minimum Division: 0.2%Brix; 0.001sgATC CompensationRange: 10Â°C~30Â°C (50Â°F~86Â°F)

The Models have only 1 Unit system: Â°C. With the indication of the percentage Wemay know the freezing Point of either ethylene glycol or propylene glycol based cooling systems. And they Can Also be Used to test the concentration of ethylene glycol or propylene glycol in antifreeze liquids. Also, it is added a Scale for measuring the the freezing Point of windshield cleaning fluid.
Measuring Range:
Ethylene Glycol:-50Â°C-0Â°C
Propylene Glycol:-50Â°C-0Â°C
Cleaning Fluids:-40Â°C-0Â°C
Battery Fluids:1.100-1.400sg
Resolution Factor: 5Â°C,5Â°C,5Â°C,0.01sg

Many hobbyist believe that the only way to calibrate refractometer is by using reverse osmosis/distilled water. That fact is usually true and is certainly appropriate for routine calibration, but it assumes that the refractometer was manufactured correctly and have not been damaged since manufacturing. As refractometers used by hobbyist become less and less expensive (with many now selling for less than $30), there is every reason to believe that they may no longer be accurate.
The only way to be sure that a refractometer gives correct information is to compare its accuracy against a pre-mixed saline solution. All refractometers should be checked in this fashion when purchased, and again any time there is a reason to be concerned.
Features
Conductivity: 53.0 mS
Salinity: 1.0264 SG / 35 PPT
Refractive Index: 1.3394 at 25Â°C
Volume: 120ml / 4 oz
Directions
Place 3 drops of the solution on the prism of your refractometer. If the value shown does not correspond to about 1.0264, make adjustments according to the refractometer's manufacturer directions.
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Deep Six Hydrometer

Manufacturer: Coralife
Brand: Coralife

11 InchMiscellaneous Aquariam Durable Construction For Long Life.The World S First Wide-range Specific Gravity Meter That Takes Its Reading From 6 Inches Below The Surface.Every Unit Is Pre-calibrated And Individually Tested For Guaranteed Accuracy.Easy To Use With A New, Revolutionary Self-leveling Feature.All items are brand new, never worn and never used. We guarantee the authenticity of all items.